Dynamic failure of dry and fully saturated limestone samples based on incubation time concept

Yuri V. Petrov, Ivan V. Smirnov*, Grigory A. Volkov, Andrei K. Abramian, Аnatoliy M. Bragov, Stanislav N. Verichev

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)

Abstract

This paper outlines the results of experimental study of the dynamic rock failure based on the comparison of dry and saturated limestone samples obtained during the dynamic compression and split tests. The tests were performed using the Kolsky method and its modifications for dynamic splitting. The mechanical data (e.g. strength, time and energy characteristics) of this material at high strain rates are obtained. It is shown that these characteristics are sensitive to the strain rate. A unified interpretation of these rate effects, based on the structural–temporal approach, is hereby presented. It is demonstrated that the temporal dependence of the dynamic compressive and split tensile strengths of dry and saturated limestone samples can be predicted by the incubation time criterion. Previously discovered possibilities to optimize (minimize) the energy input for the failure process is discussed in connection with industrial rock failure processes. It is shown that the optimal energy input value associated with critical load, which is required to initialize failure in the rock media, strongly depends on the incubation time and the impact duration. The optimal load shapes, which minimize the momentum for a single failure impact, are demonstrated. Through this investigation, a possible approach to reduce the specific energy required for rock cutting by means of high-frequency vibrations is also discussed.

Original languageEnglish
Pages (from-to)125-134
Number of pages10
JournalJournal of Rock Mechanics and Geotechnical Engineering
Volume9
Issue number1
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Compressive strength
  • Dynamic strength
  • Incubation time criterion
  • Split Hopkinson pressure bar (SHPB) test
  • Tensile strength
  • Vibration-assisted rock cutting
  • Water-saturated limestone

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